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叠前深度偏移对速度场敏感性分析

Keywords: 叠前深度偏移,速度模型,敏感性,低波数,层速度

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Abstract:

?本文分析了叠前深度偏移对速度模型的敏感性,利用广义屏方法(gsp)和marmousi速度模型比较了叠前深度偏移处理三组速度数据体的不同结果。数值模型处理结果表明:对于确定的波数域速度场数据体,低通滤波前、后叠前深度偏移结果是渐变的,说明叠前深度偏移处理对波数域速度场中的高波数成分不太敏感;选择不同的速度场,特别是改变速度场的低波数成分之后,叠前深度偏移结果将会发生明显改变,说明叠前深度偏移对速度场的低波数成分比较敏感。由于在空间域对速度模型做平滑处理很少能改变速度场数据体中的低波数成分,空间域速度场平滑不-定能改善叠前深度偏移对速度模型的敏感性,尤其在速度场含有误差时更是如此。速度建模时依照部分波场信息修改速度模型,对于单炮偏移而言,如果该炮对应的速度场低波数信息被改变,将会导致模型修改前、后深度偏移结果发生较大的改变。

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